sedimentary
Picture Jasper
Silicon Dioxide (SiO2) - Opaque Chert/Quartzite variety
Hardness: 6.5-7 (Mohs); Color: Tan, cream, and brown with landscape-like patterns; Luster: Vitreous to dull; Crystal Structure: Microcrystalline/Cryptocrystalline (Hexagonal/Trigonal system); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.58-2.91.
- Hardness
- 6
- Color
- Tan, cream, and brown with landscape-like patterns
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Tan, cream, and brown with landscape-like patterns; Luster: Vitreous to dull; Crystal Structure: Microcrystalline/Cryptocrystalline (Hexagonal/Trigonal system); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.58-2.91.
Formation & geological history
Formed through the petrification of mud, silica-rich sediments, and organic matter over millions of years. The distinctive 'picture' patterns are created by flow patterns, mineral crystallization, and impurity staining (mostly iron oxides) during the lithification process.
Uses & applications
Predominantly used for ornamental purposes including lapidary work, cabochons for jewelry, worry stones, and decorative carvings. It is a popular stone for metaphysical practitioners and mineral collectors.
Geological facts
Certain varieties like Owyhee, Biggs, and Deschutes jaspers are highly sought after for their realistic 'scenic' depictions of mountains or deserts. Each piece is unique, often described as 'nature's painting.'
Field identification & locations
Identify in the field by its high hardness (won't be scratched by a steel knife), smooth waxy texture when polished, and the characteristic tan/brown swirled patterns. Common locations include Oregon and Idaho (USA), South Africa, and Brazil.
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